Color Organ


I have had many requests
for this circuit. It was a very popular unit years ago. The basic idea
of the project is to make different colored bulbs light at different
frequencies of music. The circuit connects to the speaker outputs of
your stereo or to the back of your speaker. The music passes through the
transformer and the volume level is adjusted by the 5k ohm pot. Each
light bulb is turn on by a different frequency of sound based on the
resistor & capacitor combination in the gate circuit of the SCR. If the resistors R1, R2, or R3 are changed, the frequency of sound that will trigger the SCR will change. The isolation transformer is for protection.


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